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Folded and unfolded

Folded and unfolded. Proteins in their native state , tend to produce multiply charged ions covering a smaller range of charge states. These charge states tend to have fewer charges than an unfolded protein would have, due to the inaccessibility of many of the protonation sites.

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Folded and unfolded

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  1. Folded and unfolded Proteins in their native state, tend to produce multiply charged ions covering a smaller range of charge states. These charge states tend to have fewer charges than an unfolded protein would have, due to the inaccessibility of many of the protonation sites. Increasing the sampling cone voltage may provide sufficient energy for the protein to begin to unfold and create a wider charge state distribution centering on more highly charged ions in the lower m/z region of the spectrum.

  2. Folded and unfolded statesHolo and apo proteins

  3. Positive or Negative Ionisation? If the sample has functional groups that readily accept a proton (H+) then positive ion detection is used e.g. amines R-NH2 + H+ R-NH3+as in proteins, peptides If the sample has functional groups that readily lose a proton then negative ion detection is used e.g. carboxylic acids R-CO2H  R-CO2– and alcohols R-OH  R-O– as in saccharides, oligonucleotides

  4. WEB http://www.bmsf.unsw.edu.au/ Follow link: Training and education Articles Vestling, M.M. USING MASS SPECTROMETRY FOR PROTEINS J. Chem. Ed. 2003, 80, 122

  5. Atmospheric Pressure Chemical Ionization

  6. 1/2mv2=cost zV

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